Bug 2196783 (CVE-2023-28320)

Summary:	CVE-2023-28320 curl: siglongjmp race condition may lead to crash
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	andrew.slice, bodavis, csutherl, dbhole, ggasparb, jamacku, jclere, jmigacz, jpazdziora, kdudka, lvaleeva, mturk, omajid, peholase, pjindal, plodge, rwagner, sbroz, security-response-team, szappis
Target Milestone:	---	Keywords:	Reopened, Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	curl 8.1.0	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-05-17 14:31:45 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2207897, 2227747, 2227748, 2227749
Bug Blocks:	2196613

Description Marian Rehak 2023-05-10 08:50:35 UTC

libcurl provides several different backends for resolving host names, selected at build time. If it is built to use the synchronous resolver, it allows name resolves to time-out slow operations using `alarm()` and `siglongjmp()`. When doing this, libcurl used a global buffer that was not mutex protected and a multi-threaded application might therefore crash or otherwise misbehave.

Comment 1 Marian Rehak 2023-05-17 08:57:13 UTC

Created curl tracking bugs for this issue:

Affects: fedora-38 [bug 2207897]

Comment 2 Product Security DevOps Team 2023-05-17 14:31:43 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2023-28320

Comment 3 Jan Pazdziora 2023-07-25 16:15:51 UTC

Hello,

while doing review of the Vulnerability Assessment report of RHEL 8.6 for the purpose of Common Criteria certification, we came across this CVE. The CVE page https://access.redhat.com/security/cve/CVE-2023-28320 has Statement

  This vulnerability does not affect versions of the curl package as shipped with Red Hat Enterprise Linux 6,7,8 and 9.

What is the specific reason why RHEL 8 is not affected?

Thank you, Jan

Comment 5 Kamil Dudka 2023-08-10 08:26:10 UTC

The packaging of curl in Fedora (and consequently in RHEL-7) was switched to the threaded DNS resolver 13 years ago: https://src.fedoraproject.org/rpms/curl/c/438cbdbe

Thanks to this change, our curl packages are not affected by CVE-2023-28320.

Comment 6 Jan Pazdziora 2023-08-10 08:43:13 UTC

Great, thanks for the confirmation, Kamil.

Comment 7 Marian Rehak 2023-08-16 06:30:53 UTC

Any question for me? I was tagged in comment #6.

Comment 8 Jan Macku 2023-08-16 06:59:51 UTC

Marian, the tracker bugs for this CVE could be closed since RHEL is not affected.

see: https://bugzilla.redhat.com/show_bug.cgi?id=2196783#c5

Comment 9 Jan Pazdziora 2023-08-16 08:01:43 UTC

We now have the informat on the CVE page https://access.redhat.com/security/cve/CVE-2023-28320 reverted from the original "This vulnerability does not affect versions of the curl package as shipped with Red Hat Enterprise Linux 6,7,8 and 9." to RHEL 7 to 9 being listed as Affected ... but based on Kamil's feedback, that should not be the case.

Can you please update the information on the CVE page, incorporating Kamil's justification?

I don't really care about the internal trackers but much but those should likely be NOTABUGed as well.

Comment 10 Jan Pazdziora 2023-08-21 15:36:28 UTC

Hello Marian, could you please check the status of those trackers and the CVE page, per comments above?

Comment 11 Marian Rehak 2023-08-22 11:17:15 UTC

Sure, should be done now, thanks for the info!